在.xib创建的UIViewController中添加一个ContainerView

I have a .xib file and i want to add it a container view (to place inside a ViewController). Unfortunately a container view is only disposable by storyboard. But when i create a .xib file and i search for the container view controller, i don´t found it. Can someone give me a tips how to achieve my task? I have a .xib file and i want to add it a conta